Question

C++

The Shape.hcontains the information of the length of an edge. The derived triangle class has the length of the height of the corresponding edge. Use the two values to compute the area of this triangle in getarea member function.Create the instance and output its result in the main function.

Triangle.cpp:

#include

"triangle.h"

Triangle

::Triangle()

{

//default constructor

}

float

Triangle

::getarea()

{

//compute the area of the shape

}

void

Triangle

::setheight(

float

h

)

{

//set the height value by

the assignment in the function.

}

Shape.cpp:

#include

"shape.h"

Shape

::Shape()

{

}

Shape::Shape(

float

s

)

{

// parameterized constructor

}

void

Shape

::setdata(

float

s

)

{

//assign the parameter to the member variable.

}

float

Shape

::getdata()

{

//retrieve the value of the variable.

}

triangle.h

#include

#include "shape.h"

using namespace std;

class Triangle : public Shape

{

public:

Triangle();

float getarea();

void setheight(float);

private:

float height;

};

shape.h

#include

using namespace std;

class Shape

{

private:

float edge;

public:

Shape();

Shape(float);

void setdata(float);

float getdata();

};

Note: not trapezoid. Everything is triangle.

Answer 1

------------------- I used Visual Studio 2013, C++ Language, Console Application -------------------

-------------------Output-------------------

-------------------CODE-------------------

-------------------Shape.h-------------------

class Shape
{
private:
   float edge;

public:
   Shape();
   Shape(float);
   void setdata(float);
   float getdata();
};

-------------------Shape.cpp-------------------

#include "stdafx.h"
#include "Shape.h"

Shape::Shape()
{
   edge = 0.0;
}

Shape::Shape(float s)
{
   // In this example no use of parameterized constructor
}

void Shape::setdata(float s)
{
   edge = s;//assign the parameter to the member variable.
}

float Shape::getdata()
{
   return edge;//retrieve the value of the variable.
}

-------------------Triangle.h-------------------

#include "Shape.h"

using namespace std;
class Triangle : public Shape
{
private:
   float height;

public:
   Triangle();
   float getarea();
   void setheight(float);
};

-------------------Triangle.cpp-------------------

#include "stdafx.h"
#include "Triangle.h"

Triangle::Triangle()
{
   height = 0;//default constructor
}

float Triangle::getarea()
{
   //getdata() is called from base class Shape
   return 0.5*getdata()*height; // 1/2 * edge * height
}

void Triangle::setheight(float h)
{
   height = h;//set the height value
}

-------------------ShapeProgram.cpp-------------------

#include "stdafx.h"
#include "Triangle.h"
#include <iostream>
using namespace std;
//This is the main function class called ShapeProgram.cpp
int main()
{
   float _edge, _height;
   Triangle triangle; //Create instance of child class
   cout << "Enter edge : ";
   cin >> _edge;
   cout << "Enter height : ";
   cin >> _height;
   triangle.setdata(_edge); //Passing _edge value to base class Shape private field edge
   triangle.setheight(_height); //Passing _height value to class triangle private field height
   cout << "Area of triangle : " << triangle.getarea() << endl;
   system("pause");
   return 0;
}

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